Open sight



Search Rama M. M. MARPLE Sept. 15, 1936.

OPEN SIGHT Filed Oct. 8, 1955 -Iwe7t0r: I 27 M a/ M 3%.GEOMUR1CALmlsmuwlmm,

Patented Sept. 15, 1936 UNITED STATES PATENT OFFICE (Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 0. G. 757) This invention relates to open sight attachments for telescope sights, particularly for use on aircraft guns, and has for its object to provide a device of the type specified that will be light in weight, will not appreciably increase drag, and that requires but a small movement of the eye from the telescope to the open sight.

In the drawing:

Fig. 1 is a top plan view of a telescope sight fitted with open sights forming the subject of this application;

Fig. 2 is a view of the front sight member looking parallel to the, axis of the telescope sight; and

Fig. 3 is a view of the rear sight member from the same point of view as in Fig. 2.

In Fig. 1 the tube of the telescope sight is designated by the numeral 4, the ocular end by 5, and the objective end by 6. The rear sight member comprises two substantially semi-circular members I and 8 hinged together at 9 and having appertures in their free ends through which is passed a bolt III to draw the free ends together. A pad 2I of rubber, cork, or other suitable mate.- rial, is secured to the inner faces of members I and 8 to prevent marring the tube 4 and also to provide adequate friction to retain the sight member in the position to which it is set. A standard II, which may be made of two pieces as shown or in one piece if preferred, is secured at one end to the member I and has fixed to its other end an annulus I2 within which is a centrally disposed smaller annulus I3 supported therein by radial arms I4 or in any suitable manner. A second standard I I carrying annuli I2 and I3 is secured to the member I to extend substantially at right angles to the standard I I. If desired, the assembly may be rotated so that the standard II will be placed diametrically opposite the position of standard II, and II will occupy the position of standard II as is indicated in dotted lines.

The front sight member comprises a clamping device such as has already been described, having fixed on it a base I5 provided with a groove in its upper surface in which is seated the lower portion I6 of front sight II. A slot I8 through which passes the screw I9 to engage base I 5 provides for lateral adjustability of the front sight. As in the case of the rear sight member above described, the front sight I I extends at right angles to the sight II, the two front sights I! and I1 cooperating respectively with the rear sight annuli I3 and I3 in aiming the gun.

The present invention requires but little change in position of the head of a user to shift from telescope to open sight, or vice versa, and the telescope serves as a steady rest for the head when using the open sights.

The invention described herein may be manufactured and used by or for the Government of the United States without payment of any royalties thereon.

What is claimed is:

1. The combination with a telescope gunsight having a tube, of a first means clamped on said tube adjacent the rear end thereof, a substantially radially extending standard carried thereby, an annular open sight element carried by said standard, a second means clamped on said tube adjacent the forward end thereof, a standard transversely adjustable on said second means disposed to lie in a common radial plane of said tube with the standard on said first means, and a front sight element at the free end of the standard on said second means.

2. The combination with a telescope gunsight having a tube, of a first means clamped on said tube adjacent the rear end thereof, two standards carried thereby to extend substantially at right angles to each other and radially with respect to said tube, an annular open sight element carried by each of said standards, a second means clamped on said tube adjacent the forward end thereof, standards transversely adjustable on said second means respectively disposed to lie each in a common radial plane of said tube with the standards on said first means, and a front sight element at the free end of each of the standards on said second means.

MATTHIAS M. MARPLE. 

